NJDTechnologies

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Good night for trans-Pacific paths as geomagnetic field remains quiet; N6GN submits application for Part-5 grant; W5EST presents ”Part 3: 630m Sunrise SNRs in N. & S. Hemispheres”

– Posted in: 630 Meter Daily Reports, 630 Meters

The details for July 6, 2016 can be viewed here.

IMPORTANT REMINDER: Neither 630-meters nor 2200-meters are open to amateurs in the US yet.  Please continue to be patient and let the FCC finish their processes.  Click here to view the proposed “considerate operators” frequency usage guide for 630-meters under Part-97 rules that was developed with the input of active band users.

Storms were again a factor in North America and the Caribbean.  There were not a lot of noise complaints issued, however, but quite a few stations remain off air due to the poor weather conditions.

12-hour North American lightning summary

 

Geomagnetic conditions remain quiet to very quiet overnight.  The Bz is pointing to the North and solar wind velocities are averaging near 350 km/s.  DST values are the highest that they have been in a few weeks.

 

 

 

John, WA3ETD / WG2XKA, reported noisy summer conditions but he managed to provide reports for six WSPR stations and was reported by fourteen unique stations.  John returned to air after a number of sessions off air due to stormy weather and a need for a few repairs.

WG2XKA session WSPR activity (courtesy WA3ETD)

 

Larry, W7IUV / WH2XGP, provided reports for four WSPR stations and he received reports from fifteen unique stations.  As W7IUV, Larry provided reports for six WSPR stations.

WH2XGP 24-hour WSPR activity (courtesy NI7J)

 

Neil, W0YSE/7 / WG2XSV, reported that he was decoded by ten unique stations including WH2XCR and he decoded four WSPR station including WH2XCR, WG2XXM, WH2XXP, and WH2XGP.

Phil, VE3CIQ, reported that he decoded WG2XKA, WG2XXM, WH2XXP, WI2XSV, and WI2XUF.

Mike, WA3TTS, provided reports for eight stations overnight using his southwest EWE antenna, including WH2XXP, WG2XXM, WI2XRM, WD2XSH/15, WG2XKA, WI2XSV, WI2XUF, and AA3GZ (WH2XNG – Please fix your call sign, Jack).

Trans-Pacific report details, excluding KL7 and KH6, can be viewed here.

Hideo, JH3XCU, submitted these tables showing peak S/N and number of reports for DX -> JA for the session.

Roger, VK4YB, reported that “Those storms have moved rapidly across the Tasman sea and are now only bothering the New Zealanders. DX propagation has improved with a few surprise spots appearing.”  Roger received reports from 7L1RLL4, JA3TVF, JH3XCU, TNUKJPM, VE6JY, and W7IUV and he shared two-way reports with WH2XCR.  He provided reports for WG2XXM and WH2XXP.

Ken, K5DNL / WG2XXM, reported that he decoded three WSPR stations and he was decoded by 35 unique stations including VK4YB, WH2XCR, ZF1EJ and four Canadian stations.

Ward, K7PO / WH2XXP, received reports from 35 unique stations including VK4YB, VK2XGJ, and ZL2BCG.

WH2XXP 24-hour WSPR activity (courtesy NI7J)

 

Glenn, N6GN, filed an application for a Part-5 grant in the last few days.  Hopefully his grant will progress more quickly than the other active application awaiting action since the release of the Report and Order at the end of March.

Regional and continental WSPR breakdowns follow:

North American 24-hour WSPR activity

 

European 24-hour WSPR activity

 

Japanese 24-hour WSPR activity

 

Australian 24-hour WSPR activity

 

Eden, ZF1EJ, provided reports for three WSPR stations and he received reports from six unique stations including WH2XCR.

ZF1EJ 24-hour WSPR activity

 

Laurence, KL7L / WE2XPQ, is off air for family activities for a few days.

Merv, K9FD/KH6 / WH2XCR, provided reports for VK3HP, VK5FQ, and ZF1EJ.  He shared two-way reports with VK4YB and he received reports from VK2XGJ and ZL2BCG.  Merv’s DX report details can be viewed here.

WH2XCR 24-hour WSPR activity

 

Jim, W5EST, presents “PART 3: 630M SUNRISE SNRs IN N. & S. HEMISPHERES”:

“From Part 1 of this topic in Monday’s blog, let’s repeat 630m June 24 sunrise regime SNRs on the 35w WH2XXP-n6skm SE/NW path, heading 303°, distance 925 km.

http://njdtechnologies.net/070317/  .  That’s the top portion of today’s illustration.  SR-SR interval (purple) for June summer is short compared to December on this N. Hemisphere path.

Now see S. Hemisphere SNRs in the lower portion.  June 30 sunrise regime SNRs are graphed with time flowing right-to-left on the 5w VK4YB-vk2xgj path NNE/SSW, heading 193°, distance 844 km.   SR-SR interval (purple) for June (winter) is long compared to December summer on this S. Hemisphere path. (See Endnote.*)

Consistent with yesterday’s blog TABLE 2, the VK4YB-vk2xgj sunrise comes later in the morning and has a longer SR-SR interval than 6 months ago.  Today’s illustration does not immediately confirm whether the VK4YB-vk2xgj path has Higher SNR and Less Absorption as TABLE 2 would predict, compared to 6 months ago.

However, notice the VK4YB-vk2xgj 630m path is quite inclined toward the north: NNE-SSW. TABLE 2 further says for a pure N/S path that the N. station (VK4YB) has 1st SR of the two stations and medium low SNR. It says the S. station (vk2xgj) has 2nd SR and “Still Lower SNR.”  Today’s illustration gives a confirming example of just that.

So far, so good.  Let’s look at further 630m SNR information from the WSPR database on another blog day.  TU & GL!”

*ENDNOTE: Duration between stations’ sunrises on one-hop paths in hemispheric mid-latitudes like those of southern Canada, the USA’s lower-48, and Australia is discussed at: http://njdtechnologies.net/113016
You can also see  the same material in Your 630m Blog Book, Chapter 15 (scroll ¾):
http://njdtechnologies.net/your-630m-blog-book-a-compilation-of-the-work-and-analysis-of-jim-hollander-w5est/   
Eastward speed of Earth’s surface in km/min at a given latitude L is found by multiplying cos L times the equatorial speed, which is Earth’s circumference 40K km divided by 1440 minutes in a day.  So v = ~27.83 km/min cos L.  WH2XXP in AZ is 33.5°N., ~23.21 km/min. N6SKM Pleasanton CA is 37.66°N., ~22.034 km/min.  VK4YB near Brisbane QLD is 27.1°S., ~24.78 km/min, and VK2XGJ near Sydney NSW is 34.5°S., ~22.94 km/min.
Duration Δt of the intermediate sunrise regime is proportional to the kilometer distance D of TX/RX path divided by the eastgoing speed v of the Earth’s surface beneath that great circle.  An approximate correction factor abs(sin H + cos H ctn σ) accounts for the path heading H from WSPR database in degrees clockwise from North and the date-specific sunrise heading in degrees σ (sigma) likewise clockwise from North.  Calculate Earth’s speed v for a point near the middle of the path. Look up the sunrise heading σ for your choice of path midpoint and date using a web site such as: https://www.timeanddate.com/sun/  .
Δt (minutes) ~= abs(sin H + cos H ctn σ) D/(27.83 cos L)
(Absolute value abs() means to ignore the sign of a negative result.)
On June 24, estimated SR-SR interval on XXP-n6skm path using midpath numbers is:
Δt (minutes) ~= abs(sin 303 + cos 303 ctn 60) 925km /(27.83 cos 35.6) = 21.4 min.
 On June 30, estimated SR-SR interval on VK4YB-vk2xgj path using midpath numbers is:
Δt (minutes) ~= abs(sin 193 + cos 193 ctn 63) 844km /(27.83 cos(-30.8)) = 27.9 min.
The calculated values are about 10% less than the estimated SR-SR intervals based on time-and-date web sites due to a variety of errors each way. Among the errors, there’s about a minute coarseness in my reading each SR time from the web sites, uncertainty in stations’ latitudes and positions for purposes of the web sites and the formula, and path heading H for the formula being the heading at the TX end of the path.
The SR-SR intervals 6 months earlier for each place, in effect, negate the signs on the cotangents “ctn” and calculate to:  47.1 minutes for XXP-n6skmfor USA winter 6 months earlier (not too different from 45 minutes for Nov. 30 as blogged here July 3). The calculation estimates SR-SR 10.5 minutes for VK4YB-vk2xgj in Australian summer six months ago.

 


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